Poster frame



FIG. 1 is a front elevational view of the poster frame showing the new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side thereof;

FIG. 4 is a top plan view thereof, the bottom plan view is identical; and,

FIG. 5 is a rear elevational view of the poster frame shown in FIG. 1.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a poster frame, as show and described. 